* {
    margin: 0;
    padding: 0;
}

html {
    background-color: #EEE;
}

header,
main,
footer {
    display: block;
    background-color: #FFF;
    width: 800px;
    margin: 0 auto;
}

header {
    text-align: center;
    padding: 20px 0;
}

h1 {
    font-size: 40px;
    color: #0ab2ff;
    text-shadow: 4px 4px 5px blue;
    letter-spacing: 10px;
}

h1>span {
    letter-spacing: 20px;
}

hgroup>h2 {
    margin-top: 20px;
    color: #999;
    letter-spacing: 5px;
    font-size: 16px;
    font-weight: 500;
    text-decoration: underline;
    line-height: 20px;
}

hgroup::after {
    display: block;
    content: "";
    height: 20px;
}

nav {
    display: flex;
    justify-content: center;
    align-items: center;
}

nav div {
    margin: 20px 10px;
    width: 100px;
    height: 50px;
    text-align: center;
    line-height: 50px;
    border-radius: 10px;
    box-shadow: 2px 2px 3px #000;
    cursor: pointer;
}

.active {
    color: #0ab2ff;
    box-shadow: 2px 2px 3px #0ab2ff;
    border-bottom: 2px #0ab2ff solid;
}

main {
    margin-top: 20px;
    overflow: hidden;
}

main .input_wrap {
    width: 600px;
    margin: 20px auto;
    display: flex;
    justify-content: center;
    align-items: center;
}

.input_wrap>input {
    display: block;
    border: 1px #aaa solid;
    border-radius: 10px;
    flex: 1;
    height: 38px;
    padding: 0 10px;
    font-size: 15px;
    outline-style: none;
}

input[type="checkbox"] {
    cursor: pointer;
}

.input_wrap>button {
    padding: 10px 10px;
    color: #FFF;
    background-color: #0ab2ff;
    border-radius: 8px;
    border: none;
    text-align: center;
    margin-left: 20px;
    cursor: pointer;
    outline-style: none;
}

::-webkit-scrollbar {
    width: 0px;
}

.input_wrap>input:focus {
    border: 1px #0ab2ff solid;
    border-radius: 10px;
}

.things_wrap {
    width: 600px;
    box-sizing: border-box;
    margin: 15px auto;
    border: 1px #aaa solid;
    border-radius: 8px;
}

.things_wrap .things_item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 50px;
    border-bottom: 1px #aaa solid;
    padding: 0px 20px;
}

.things_wrap .isnull {
    color: #666;
    text-align: center;
    line-height: 50px;
    display: none;
}

.things_item .content_left {
    display: flex;
    align-items: center;
    color: #666;
}

.things_item.isdone .things_content {
    color: #999;
    text-decoration: line-through;
}

.things_item .content_left .things_content {
    margin-left: 10px;
}

.things_item .delete_item {
    color: #0ab2ff;
    cursor: pointer;
}

.management_buttons {
    padding: 10px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.management_buttons .buttons {
    display: flex;
    justify-content: center;
}

.management_buttons .buttons div {
    width: 80px;
    height: 40px;
    box-sizing: border-box;
    text-align: center;
    line-height: 40px;
    cursor: pointer;
}

.management_buttons .buttons div:nth-child(1) {
    border-radius: 8px 0 0 8px;
    border-top: 1px #aaa solid;
    border-left: 1px #aaa solid;
    border-bottom: 1px #aaa solid;
}

.management_buttons .buttons div:nth-child(2) {
    border: 1px #aaa solid;
}

.management_buttons .buttons div:nth-child(3) {
    border-radius: 0 8px 8px 0;
    border-top: 1px #aaa solid;
    border-right: 1px #aaa solid;
    border-bottom: 1px #aaa solid;
}

.management_buttons .buttons div.button_active {
    background-color: #0ab2ff;
    color: #FFF;
    border: none;
}

.management_buttons .nudone_total_num {
    color: #666;
    font-size: 14px;
}

.management_buttons .clear_done {
    color: #0ab2ff;
    font-size: 16px;
}

footer section {
    padding: 50px 0 20px 0;
    text-align: center;
    color: #666;
}

#notepad_content {
    display: none;
}